Evaluation of the cardiopulmonary and antinociceptive effects of bupivacaine administered epidurally at the first lumbar vertebra in awake dogs oleh P.E.S. Silva, N. Nunes, A.P. Gering, T.C. Prada, A.P.R. Simões, T.F.V. Bompadre, R.V.G. Castro, D.P. Paula